2014 t680. There are two squares beside foot valve on firewall. One has airlines connected to push pull fittins. Other square is empty ports with no lines. One of the empty ports on this one leaks air only when trailer valve is pulled out. Does this mean the dash valve is bad? Thanks in advance and happy trucking
2014 T680 Air exhausting at firewall
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by insanityeight, Aug 20, 2021.
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Is this with trailer gladhand connected? Sounds like trailer back feeding from bad trailer relay valve.
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Air up truck fully, set all parking brakes and disconnect gladhands. Air shouldn't come out of gladhands on trailer.
Last edited: Aug 21, 2021
insanityeight Thanks this. -
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Yes, that is your problem. Couple of different ways to plumb trailers, but you need relay valve that controls parking brake on trailer. Some all in on valve, some separate spring brake relay valve.
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Goodysnap and spsauerland Thank this.
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